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Larkman Nunatak 12203
Basic information Name: Larkman Nunatak 12203
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12203
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 28 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 38(2)  (2015)  LL3.8
Meteoritical Bulletin:  MB 104  (2015)  LL3.8
Recommended:  LL3.8    [explanation]

This is 1 of 33 approved meteorites classified as LL3.8.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 28 Aug 2015
Writeuphelp
Writeup from AMN 38(2):
Sample Number LAR 12203
Newsletter 38,2
Location Larkman Nunatak
Field Number 23171
Dimensions 4.0 x 2.5 x 1.6
Weight 28.04
Original Classification LL3.8 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 12-34; Ferrosilite (mol%): 18-26
Macroscopic Description - Cecilia Satterwhite
The exterior has black fusion crust with some evaporites. Exposed interior shows a gray matrix with weathered areas. The interior is a dark gray to black matrix with heavy oxidation.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section exhibits numerous well-defined chondrules (up to 2 mm) in a matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is abundant. The meteorite is modestly stained with hydrated iron oxides of terrestrial origin. Silicates are unequilibrated; olivines range from Fa12-34 and pyroxene is Fs18-26. The meteorite is an LL3 chondrite (estimated subtype 3.8).
Antarctic Meteorite Images for Sample LAR 12203
Lab Photo of Sample LAR 12203 Displaying North Orientation  Thin Section Photo of Sample LAR 12203 in Plane-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12203 in Reflected Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12203 in Cross-Polarized Light with 2.5X Magnification 
Thin Section Photo of Sample LAR 12203 in Plane-Polarized Light with 5X Magnification  Thin Section Photo of Sample LAR 12203 in Reflected Light with 5X Magnification  Thin Section Photo of Sample LAR 12203 in Cross-Polarized Light with 5X Magnification 
Data from:
  MB104
  Table 0
  Line 0:
Date:2012
Mass (g):28.04
Pieces:1
Class:LL3.8
Weathering grade:Be
Fayalite (mol%):12-34
Ferrosilite (mol%):18-26
Classifier:SI
Type spec mass (g):28.04
Type spec location:JSC
Main mass:JSC
Finder:ANSMET
Comments:Submitted by AMN
Institutions
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 38(2) (2015), JSC, Houston
Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)

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